Jeff Ridenhour, the man who was placed in the Drill Chair from the original Saw movie, was strapped to a wall with large metal spikes that rested behind it. Tapp needed to play a matching game involving different symbols which would appear on different television screens to release Jeff, but for every mistake Tapp made, a spike from behind the wall would pierce through Jeff's body. However, for every correct pair, a spike would retract. Should Tapp have failed and matched enough symbols incorrectly, Jeff would have been skewered to death by the spikes.
Hello Jeff. Day after day you live alone, isolating yourself, to avoid the stress of reality. You have tried to take your own life on multiple occasions because you cannot endure the mental pain of everyday life. Now, you will have to endure real pain. The game is simple: Detective Tapp must match all of the corresponding symbols and you will be released; match the wrong symbols, and a metal spike will pierce your body; match too many wrong symbols, and your suffering will end.
Jigsaw explaining the game